I have a Tandem Island and live in CT near Long Island Sound, so fishing is mostly Stripers, Blues and Tog. I also fish freshwater lakes that have largemouth, smallmouth and trout.

Just wondering if I should pay more for the DSI version or the standard/regular sonar?I realize that a TI fishes a smaller area, tending on the shallow areas but you cannot get too close to rocks cause you might be pushed into shoals by tides and winds since you might not have enough "Pedal Power" to clear out of a danger zone quickly.

I didn't know if a DSI sonar better for reef fishing or finding suspended schools of fish?? Thanks for your ideas.....

Also, how bout them data cards for the coastline or individual lakes.... Is it worth the cost?